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 > 1747977190
  ) 
  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 
  9000, 40

Query time 0.30173

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
88095 Morfina (Original Mix) Toolbox Digital Shop P 0
88094 Heads (Original Mix) Toolbox Digital Shop P 0
88093 Vortex (Original Mix) Toolbox Digital Shop P 0
88092 Take Me Away (Original Mix) Toolbox Digital Shop P 0
88091 Fucked Frequencies (Original Mix) Toolbox Digital Shop P 0
88090 Creampie (Original Mix) Toolbox Digital Shop P 0
88089 Memorized (Original Mix) Toolbox Digital Shop P 0
88088 Isolation (Original Mix) Toolbox Digital Shop P 0
88087 My Name Is Hardcore (Original Mix) Toolbox Digital Shop P 0
88086 Baiz (Original Mix) Toolbox Digital Shop P 0
88082 Scared (Radio Edit) Toolbox Digital Shop P 0
88081 Scared (Extended Mix) Toolbox Digital Shop P 0
87851 Maltezer (Original Mix) Toolbox Digital Shop P 0
87731 Reign of Terror (909 Junkies Remix) Toolbox Digital Shop P 0
87730 Hartcore Factory (Original Mix) Toolbox Digital Shop P 0
87729 XTC (Original Mix) Toolbox Digital Shop P 0
87728 Pandemic (Original Mix) Toolbox Digital Shop P 0
88625 Summer Time (Old Skool Junkies Breakbeat Remix) Toolbox Digital Shop P 0
88624 Summer Time (X-Cyte Hardcore Mix) Toolbox Digital Shop P 0
88623 Summer Time (Original Mix) Toolbox Digital Shop P 0
88039 Screamerz (Original Mix) Toolbox Digital Shop P 0
88532 The Holy One (Original Mix) Toolbox Digital Shop P 0
88531 No Antidote (Original Mix) Toolbox Digital Shop P 0
88530 Let It Out (Original Mix) Toolbox Digital Shop P 0
88406 Kill Cop's (The Loading Project Remix) Toolbox Digital Shop P 0
88405 Kill Cop's (Original Mix) Toolbox Digital Shop P 0
88404 Docside (Original Mix) Toolbox Digital Shop P 0
88403 A.C.A.B (Original Mix) Toolbox Digital Shop P 0
88402 Hardcore Bastardz (Original Mix) Toolbox Digital Shop P 0
88401 Rude Killaz (Original Mix) Toolbox Digital Shop P 0
87762 Jimmy The Bastard (Original Mix) Toolbox Digital Shop P 0
87678 Never Agent (Original Mix) Toolbox Digital Shop P 0
88629 All Over Again (Radio Edit) Toolbox Digital Shop P 0
88628 Part E Time (Radio Edit) Toolbox Digital Shop P 0
88627 All Over Again (Original Mix) Toolbox Digital Shop P 0
88626 Part E Time (Original Mix) Toolbox Digital Shop P 0
88575 Sipping On Hate (Original Mix) Toolbox Digital Shop P 0
88574 Dope Track (Original Mix) Toolbox Digital Shop P 0
88573 Get Louder (Original Mix) Toolbox Digital Shop P 0
88149 Anarchy (Original Mix) Toolbox Digital Shop P 0