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 (1, 28, 37) 
  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 > 1747386364
  ) 
  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 
  11280, 40

Query time 0.24253

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 3 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
14641 Microwave (2012 Remix) Toolbox Digital Shop P 0
14640 Disco Rocket (Original Mix) Toolbox Digital Shop P 0
14637 Disco Balls (Original Mix) Toolbox Digital Shop P 0
14635 Meet The Beat (Original Mix) Toolbox Digital Shop P 0
14634 Tech Magnet (Original Mix) Toolbox Digital Shop P 0
14633 Ferret (Original Mix) Toolbox Digital Shop P 0
14632 Tunnel Vision (Original Mix) Toolbox Digital Shop P 0
14631 It Never Sleeps (Original Mix) Toolbox Digital Shop P 0
14630 Try Harder (Original Mix) Toolbox Digital Shop P 0
14629 Red Dawn (Original Mix) Toolbox Digital Shop P 0
14628 Now (In2ition Remix) Toolbox Digital Shop P 0
14627 De Part (Original Mix) Toolbox Digital Shop P 0
14626 Small Town USA (Original Mix) Toolbox Digital Shop P 0
14481 Fr33k (Original Mix) Toolbox Digital Shop P 0
14480 Storm (Original Mix) Toolbox Digital Shop P 0
14482 Fr33k (The Monitorz Remix) Toolbox Digital Shop P 0
24684 Sunrize (Original Mix) Toolbox Digital Shop P 0
24683 Storm (Original Mix) Toolbox Digital Shop P 0
14436 Sound of Silence (Original Mix) Toolbox Digital Shop P 0
14434 Wanna Be With You (Original Mix) Toolbox Digital Shop P 0
14438 Your Body (Dj Oskar & Dj Suko Remix) Toolbox Digital Shop P 0
14437 Your Body (Original Mix) Toolbox Digital Shop P 0
14411 Long Gone (Original Mix) Toolbox Digital Shop P 0
16539 Glimmer (Original Mix) Toolbox Digital Shop P 0
14409 Restart (Original Mix) Toolbox Digital Shop P 0
14410 Do You Know It (Original Mix) Toolbox Digital Shop P 0
14101 Final Resolution (Original Mix) Toolbox Digital Shop P 0
14138 Jellyfish (Original Mix) Toolbox Digital Shop P 0
14137 Digital Family (Original Mix) Toolbox Digital Shop P 0
31447 Unbounded (Original Mix) Toolbox Digital Shop P 0
31446 Still Be Friends (Original Mix) Toolbox Digital Shop P 0
31445 Music Is My Life (Lox & Leigh Green Remix) Toolbox Digital Shop P 0
31444 D.K.H.U.K. (Original Mix) Toolbox Digital Shop P 0
31443 Choose Your Door (Original Mix) Toolbox Digital Shop P 0
31442 Covonia (WhiteHayz Remix) Toolbox Digital Shop P 0
31441 Wupwupwupwup (Original Mix) Toolbox Digital Shop P 0
31440 Never Too Long (Original Mix) Toolbox Digital Shop P 0
31439 Revive (Original Mix) Toolbox Digital Shop P 0
31438 Take Over (Original Mix) Toolbox Digital Shop P 0
31437 Dino Walkin (Original Mix) Toolbox Digital Shop P 0