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 > 1747960210
  ) 
  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 
  9320, 40

Query time 0.53087

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
87149 Fight Back (Original Mix) Toolbox Digital Shop P 0
87148 Fuck My Enemy (Original Mix) Toolbox Digital Shop P 0
87147 Combination (Original Mix) Toolbox Digital Shop P 0
87146 Beast Drumz (Original Mix) Toolbox Digital Shop P 0
87478 Deranged Dribble (Original Mix) Toolbox Digital Shop P 0
87461 Heart Of Gold (Original Mix) Toolbox Digital Shop P 0
87267 Techno Rocker (Original Mix) Toolbox Digital Shop P 0
87013 Our Voice (Radio Edit) Toolbox Digital Shop P 0
87012 Our Voice (Extended Mix) Toolbox Digital Shop P 0
86982 Keeps Me High (Original Mix) Toolbox Digital Shop P 0
87168 Coming Up Hot (Original Mix) Toolbox Digital Shop P 0
87437 My Head Goes (La La La La La) (Synthetic's Happy Hardcore Remix) Toolbox Digital Shop P 0
87163 Where Are We Going (Radio Edit) Toolbox Digital Shop P 0
87162 Where Are We Going (Extended Mix) Toolbox Digital Shop P 0
87438 Don't Give A Fuck (Original Mix) Toolbox Digital Shop P 0
87288 Annihilation (Aggressive Act Remix) Toolbox Digital Shop P 0
87287 MASSACRO (Extended Mix) Toolbox Digital Shop P 0
87025 So Good (Original Mix) Toolbox Digital Shop P 0
87022 Kiss My Ass (Original Mix) Toolbox Digital Shop P 0
86884 Comeback Time (Original Mix) Toolbox Digital Shop P 0
88075 Control (Fitzy-K Radio Mix) Toolbox Digital Shop P 0
88074 Control (Fitzy-K Remix) Toolbox Digital Shop P 0
88073 Miracle (Radio Mix) Toolbox Digital Shop P 0
88072 Miracle (Original Mix) Toolbox Digital Shop P 0
87072 Capture the Flag (Original Mix) Toolbox Digital Shop P 0
87071 Catch Me (Original Mix) Toolbox Digital Shop P 0
87070 Let's Get It On (Original Mix) Toolbox Digital Shop P 0
86983 7 Years Old (Original Mix) Toolbox Digital Shop P 0
86835 Reincarnate (Original Mix) Toolbox Digital Shop P 0
86603 Still I Rise (Radio Edit) Toolbox Digital Shop P 0
86602 Still I Rise (Extended Mix) Toolbox Digital Shop P 0
86601 Beat Goes Boom (Original Mix) Toolbox Digital Shop P 0
87357 22Gether (2020 Mix) Toolbox Digital Shop P 0
86850 X-corsism (Original Mix) Toolbox Digital Shop P 0
86849 Noise (Original Mix) Toolbox Digital Shop P 0
86848 Drop A Flow (Original Mix) Toolbox Digital Shop P 0
86847 The Only Way Out (Original Mix) Toolbox Digital Shop P 0
86846 This Is The Way (Original Mix) Toolbox Digital Shop P 0
86845 Lets Rolll (Original Mix) Toolbox Digital Shop P 0
86693 Can't Go Home (Radio Edit) Toolbox Digital Shop P 0