SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'en' 
  LEFT JOIN cscart_product_restricted_countries AS prc ON prc.product_id = products.product_id 
  AND prc.country_code = 'US' 
WHERE 
  1 
  AND cscart_categories.category_id IN (22, 32, 33, 34, 39) 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND (
    products.available_worldwide = 'Y' 
    OR prc.country_code IS NULL
  ) 
  AND !(
    products.out_of_stock_actions = 'B' && products.avail_since > 1747959997
  ) 
  AND products.parent_product_id = 0 
GROUP BY 
  products.product_id 
ORDER BY 
  products.timestamp desc, 
  products.product_id desc, 
  products.product_id ASC 
LIMIT 
  17520, 80

Query time 0.36374

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE companies ALL PRIMARY 1 Using where; Using temporary; Using filesort
1 SIMPLE cscart_categories range PRIMARY,c_status,p_category_id PRIMARY 3 5 Using where; Using join buffer (flat, BNL join)
1 SIMPLE products_categories ref PRIMARY,pt PRIMARY 3 toolboxdigitalshop_dev.cscart_categories.category_id 908 Using index
1 SIMPLE products eq_ref PRIMARY,status,idx_parent_product_id PRIMARY 3 toolboxdigitalshop_dev.products_categories.product_id 1 Using where
1 SIMPLE shared_descr eq_ref PRIMARY,product_id,company_id PRIMARY 13 toolboxdigitalshop_dev.products_categories.product_id,const,const 1 Using where
1 SIMPLE prc eq_ref PRIMARY PRIMARY 9 toolboxdigitalshop_dev.products_categories.product_id,const 1 Using where; Using index
1 SIMPLE descr1 eq_ref PRIMARY,product_id PRIMARY 9 toolboxdigitalshop_dev.products_categories.product_id,const 1 Using where
1 SIMPLE prices ref usergroup,product_id,lower_limit,usergroup_id usergroup 3 toolboxdigitalshop_dev.products_categories.product_id 1 Using where; Using index

Result

product_id product company_name product_type parent_product_id
46924 Ready For War (Original Mix) Toolbox Digital Shop P 0
46923 Dum Dooby Dum (Original Mix) Toolbox Digital Shop P 0
46922 Gazometer (Original Mix) Toolbox Digital Shop P 0
46873 Metal Core (Original Mix) Toolbox Digital Shop P 0
46872 Criminal Minded (Original Mix) Toolbox Digital Shop P 0
46871 Energy Overdose (Original Mix) Toolbox Digital Shop P 0
46870 Techno Renegade (Scott Brown Remix) Toolbox Digital Shop P 0
46869 Check Check (Scott Brown Remix) Toolbox Digital Shop P 0
46868 Mind Transfer (Original Mix) Toolbox Digital Shop P 0
46867 Check Dis Out (Original Mix) Toolbox Digital Shop P 0
46866 We'll Delete The Weak (Scott Brown Remix) Toolbox Digital Shop P 0
46865 Brain-Damaged (Original Mix) Toolbox Digital Shop P 0
46864 Mutilator (Original Mix) Toolbox Digital Shop P 0
46863 Burn Mother F**ker (Original Mix) Toolbox Digital Shop P 0
46862 Eliminator (Original Mix) Toolbox Digital Shop P 0
46861 Overload (Original Mix) Toolbox Digital Shop P 0
46860 Fuck You (Original Mix) Toolbox Digital Shop P 0
46859 Electroid (Original Mix) Toolbox Digital Shop P 0
46858 Jump (Original Mix) Toolbox Digital Shop P 0
46857 Life Force (Original Mix) Toolbox Digital Shop P 0
46624 Waves (Original Mix) Toolbox Digital Shop P 0
46568 Grim Reaper (Original Mix) Toolbox Digital Shop P 0
46567 Cut It Up (Original Mix) Toolbox Digital Shop P 0
46565 Like An Animal (Original Mix) Toolbox Digital Shop P 0
46822 Acidulous (Original Mix) Toolbox Digital Shop P 0
46821 Get On The Floor (Original Mix) Toolbox Digital Shop P 0
46820 This Mutha Fukka (Original Mix) Toolbox Digital Shop P 0
46819 Equazion, Pt. 4 (Original Mix) Toolbox Digital Shop P 0
46901 Anxious Heart (Original Mix) Toolbox Digital Shop P 0
46900 I Cant Stop (Original Mix) Toolbox Digital Shop P 0
46899 Got To Go (Chris Fear & Jenny J 2014 Remix) Toolbox Digital Shop P 0
46898 Sonic Rush (Original Mix) Toolbox Digital Shop P 0
46897 Ready To Detonate (Original Mix) Toolbox Digital Shop P 0
46896 Jumper (Original Mix) Toolbox Digital Shop P 0
46895 The Future Of Sound (Original Mix) Toolbox Digital Shop P 0
46894 Ambient Angel (Original Mix) Toolbox Digital Shop P 0
46893 Saviour (Original Mix) Toolbox Digital Shop P 0
46892 Rainbow Hardcore (Original Mix) Toolbox Digital Shop P 0
46891 Skydive (Original Mix) Toolbox Digital Shop P 0
46890 Piano 'N' Acid (Jonny El & Fastraxx Remix) Toolbox Digital Shop P 0
46889 All I Wanna Be (Original Mix) Toolbox Digital Shop P 0
46888 Feel So Good (Original Mix) Toolbox Digital Shop P 0
46887 Put Your Hands Up (Original Mix) Toolbox Digital Shop P 0
46886 In Your Arms Tonight (Original Mix) Toolbox Digital Shop P 0
46885 House Aggression (Original Mix) Toolbox Digital Shop P 0
46884 Most Wanted (Original Mix) Toolbox Digital Shop P 0
46883 Flying (Wings Of Love) (Eufeion 2015 Remix) Toolbox Digital Shop P 0
46882 Carry On (Original Mix) Toolbox Digital Shop P 0
46881 Cool Your Engines (X-FIR3 & Sensation Remix) Toolbox Digital Shop P 0
46880 Let Me Tell You (Original Mix) Toolbox Digital Shop P 0
46879 Pump Up The Thinking (Original Mix) Toolbox Digital Shop P 0
46878 Technophobia (Power Mix) Toolbox Digital Shop P 0
46877 Sunglasses (Original Mix) Toolbox Digital Shop P 0
46621 Join Us Now (Original Mix) Toolbox Digital Shop P 0
46620 Stepmania (Original Mix) Toolbox Digital Shop P 0
46619 Roar (Original Mix) Toolbox Digital Shop P 0
46618 Heart On Fire (Original Mix) Toolbox Digital Shop P 0
46617 Music's Hypnotising (Original Mix) Toolbox Digital Shop P 0
46616 No Matter What (Original Mix) Toolbox Digital Shop P 0
46615 Break These Records (Original Mix) Toolbox Digital Shop P 0
46614 Believe In Something (Original Mix) Toolbox Digital Shop P 0
46613 Blow Out Part 4 (Original Mix) Toolbox Digital Shop P 0
46535 Glutamate (Radio Mix) Toolbox Digital Shop P 0
46534 Aspartate (Original Mix) Toolbox Digital Shop P 0
46533 Glycine (Original Mix) Toolbox Digital Shop P 0
46532 Glutamate (Original Mix) Toolbox Digital Shop P 0
46519 Before The Sun (Original Mix) Toolbox Digital Shop P 0
46477 Fading Away (Future Shock Remix) Toolbox Digital Shop P 0
46472 Axxelis (Original Mix) Toolbox Digital Shop P 0
46471 Musi-K (Original Mix) Toolbox Digital Shop P 0
46437 Destroyer (Original Mix) Toolbox Digital Shop P 0
46702 Xcelerator (Equazion Remix) Toolbox Digital Shop P 0
46701 Xcelerator (Original Mix) Toolbox Digital Shop P 0
46700 Quartz (Original Mix) Toolbox Digital Shop P 0
46699 Hardcore Disco (Original Mix) Toolbox Digital Shop P 0
46348 Out My Mind (Original Mix) Toolbox Digital Shop P 0
46329 All The Time In The World (Original Mix) Toolbox Digital Shop P 0
46580 Obdrutate (Original Mix) Toolbox Digital Shop P 0
46579 We Are The Resistance (Vive La Frenchcore Culemborg Anthem 2015) Toolbox Digital Shop P 0
46358 Hentai (DJ Edit) Toolbox Digital Shop P 0