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' 
  LEFT JOIN cscart_discussion ON cscart_discussion.object_id = products.product_id 
  AND cscart_discussion.object_type = 'P' 
  LEFT JOIN (
    SELECT 
      cscart_discussion_rating.thread_id, 
      AVG(
        cscart_discussion_rating.rating_value
      ) AS overall_rating 
    FROM 
      cscart_discussion_rating 
    GROUP BY 
      thread_id
  ) AS ratings ON ratings.thread_id = cscart_discussion.thread_id 
WHERE 
  1 
  AND cscart_categories.category_id IN (6, 35, 80) 
  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 > 1747385458
  ) 
  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 
  5160, 40

Query time 0.15032

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY companies ALL PRIMARY 1 Using where; Using temporary; Using filesort
1 PRIMARY cscart_categories range PRIMARY,c_status,p_category_id PRIMARY 3 3 Using where; Using join buffer (flat, BNL join)
1 PRIMARY products_categories ref PRIMARY,pt PRIMARY 3 toolboxdigitalshop_dev.cscart_categories.category_id 908 Using index
1 PRIMARY products eq_ref PRIMARY,status,idx_parent_product_id PRIMARY 3 toolboxdigitalshop_dev.products_categories.product_id 1 Using where
1 PRIMARY shared_descr eq_ref PRIMARY,product_id,company_id PRIMARY 13 toolboxdigitalshop_dev.products_categories.product_id,const,const 1 Using where
1 PRIMARY prc eq_ref PRIMARY PRIMARY 9 toolboxdigitalshop_dev.products_categories.product_id,const 1 Using where; Using index
1 PRIMARY cscart_discussion ref object_id object_id 6 toolboxdigitalshop_dev.products_categories.product_id,const 1 Using where; Using index
1 PRIMARY descr1 eq_ref PRIMARY,product_id PRIMARY 9 toolboxdigitalshop_dev.products_categories.product_id,const 1 Using where
1 PRIMARY prices ref usergroup,product_id,lower_limit,usergroup_id usergroup 3 toolboxdigitalshop_dev.products_categories.product_id 1 Using where; Using index
1 PRIMARY <derived2> ref key0 key0 4 toolboxdigitalshop_dev.cscart_discussion.thread_id 2 Using where
2 DERIVED cscart_discussion_rating ALL thread_id 1 Using temporary; Using filesort

Result

product_id product company_name product_type parent_product_id
72204 Supersonic Warrior (Original Mix) Toolbox Digital Shop P 0
70361 Hybridized Dynamite Toolbox Digital Shop P 0
73117 Love Reigns (Original Mix) Toolbox Digital Shop P 0
73112 Antimatter Toolbox Digital Shop P 0
71487 Supa Donkey Pi55 (Original Mix) Toolbox Digital Shop P 0
72922 Strapped In Toolbox Digital Shop P 0
72854 Stalker Toolbox Digital Shop P 0
72853 Keep On Toolbox Digital Shop P 0
72851 Rezonator Toolbox Digital Shop P 0
71741 Fresh To The Familar Toolbox Digital Shop P 0
71202 Rock Right Now (Mark Hard Remix) Toolbox Digital Shop P 0
71175 Health & Safety (Radio Edit) Toolbox Digital Shop P 0
71174 Health & Safety (Club Mix) Toolbox Digital Shop P 0
71432 Pow Dong Toolbox Digital Shop P 0
71152 Unforgotton Friends (The Last Ballad) (Original Mix) Toolbox Digital Shop P 0
71742 Racist Bass Toolbox Digital Shop P 0
71123 Pump This Party (Original Mix) Toolbox Digital Shop P 0
71178 Chemically Bad Toolbox Digital Shop P 0
42032 Mutilation Toolbox Digital Shop P 0
71586 24 Hour Blank Toolbox Digital Shop P 0
71585 Hallucinate State Toolbox Digital Shop P 0
71318 Bass Invader (Original Mix) Toolbox Digital Shop P 0
71549 Tribute Toolbox Digital Shop P 0
71433 Bootie Shaker Toolbox Digital Shop P 0
70126 8 Rules Toolbox Digital Shop P 0
71459 Red Indian Toolbox Digital Shop P 0
71014 Floor Twist (Original Mix) Toolbox Digital Shop P 0
70360 Turn It Around Toolbox Digital Shop P 0
71345 Radicalade Toolbox Digital Shop P 0
71344 In Da Hood Toolbox Digital Shop P 0
71285 Brainchild Toolbox Digital Shop P 0
71177 The Jammer (2018 Rework) Toolbox Digital Shop P 0
71319 Mixed Emotions Toolbox Digital Shop P 0
71290 Inhuman Toolbox Digital Shop P 0
71107 Listento My Heart (Original Mix) Toolbox Digital Shop P 0
71022 Rapture (STRIX Remix) Toolbox Digital Shop P 0
71284 Stronger Toolbox Digital Shop P 0
71277 Banged Up Toolbox Digital Shop P 0
71228 The Nun Toolbox Digital Shop P 0
71227 Here We Go Toolbox Digital Shop P 0