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 (4, 29, 30, 36) 
  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 > 1747976972
  ) 
  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 
  7640, 40

Query time 0.47186

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 4 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
66793 Snap Attack (Original Mix) Toolbox Digital Shop P 0
66792 Almost Famous (Unreleased Version) Toolbox Digital Shop P 0
66791 What A Night (Original Mix) Toolbox Digital Shop P 0
66790 Pumping Music (Original Mix) Toolbox Digital Shop P 0
66789 Big Bad Bells (Original Mix) Toolbox Digital Shop P 0
67007 Bassroom (Original Mix) Toolbox Digital Shop P 0
66714 House Work (Original Mix) Toolbox Digital Shop P 0
66711 Back 2 The Old Skool (Original Mix) Toolbox Digital Shop P 0
66706 I Dare You (Original Mix) Toolbox Digital Shop P 0
66704 Laser Lips (Original Mix) Toolbox Digital Shop P 0
66697 Bandit (Original Mix) Toolbox Digital Shop P 0
66696 A Feeling (Joe Longbottom & Leigh D Remix) Toolbox Digital Shop P 0
66692 Original Gangsta MKE (Original Mix) Toolbox Digital Shop P 0
66725 You Aint (Bounce Mix) Toolbox Digital Shop P 0
66721 Master D (Original Mix) Toolbox Digital Shop P 0
66312 Bring The Platform (Original Mix) Toolbox Digital Shop P 0
66282 G.Party (DJ Lara Rework) Toolbox Digital Shop P 0
66281 G.Party (Original Mix) Toolbox Digital Shop P 0
66662 Hands Up (Original Mix) Toolbox Digital Shop P 0
66619 Poky Selfie (Original Mix) Toolbox Digital Shop P 0
66618 Hammer Poky (Original Mix) Toolbox Digital Shop P 0
66617 Maxin' Relaxin' (Handyman Remix) Toolbox Digital Shop P 0
66616 Over Heat (Original Mix) Toolbox Digital Shop P 0
66615 Make Some Noise (Original Mix) Toolbox Digital Shop P 0
66614 I Love Hard House 2 (Original Mix) Toolbox Digital Shop P 0
66613 Pump It (Original Mix) Toolbox Digital Shop P 0
66612 The Most Annoyin Track In The World (Original Mix) Toolbox Digital Shop P 0
66611 Big Booty (Original Mix) Toolbox Digital Shop P 0
66610 My House (Handyman Remix) Toolbox Digital Shop P 0
66609 Qatja Slip (Original Mix) Toolbox Digital Shop P 0
66608 Show Me Poky (Original Mix) Toolbox Digital Shop P 0
66526 OMG! (Original Mix) Toolbox Digital Shop P 0
66206 The Weapon (Original Mix) Toolbox Digital Shop P 0
66205 Panik (Original Mix) Toolbox Digital Shop P 0
66204 Baloney Pony (Original Mix) Toolbox Digital Shop P 0
66203 Boney Butt (Original Mix) Toolbox Digital Shop P 0
66202 Not Glorious (Original Mix) Toolbox Digital Shop P 0
66201 Take Me There (Original Mix) Toolbox Digital Shop P 0
66200 When I'm Gone (Original Mix) Toolbox Digital Shop P 0
66199 Dosing Up (Original Mix) Toolbox Digital Shop P 0