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 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 (
    (
      1 
      AND products.product_id IN (
        101779, 101780, 101781, 101782, 101783, 
        101784, 101785, 101786, 101787, 101788, 
        101789, 101790, 101791, 101792, 101793, 
        101794, 101795, 101796, 101797, 101798, 
        101799, 101800, 101801, 101802, 101803, 
        101804, 101805, 101806, 101807, 101808
      )
    ) 
    AND companies.status IN ('A') 
    AND prices.usergroup_id IN (0, 0, 1)
  ) 
  AND (
    products.available_worldwide = 'Y' 
    OR prc.country_code IS NULL
  ) 
GROUP BY 
  products.product_id 
ORDER BY 
  products.timestamp desc, 
  products.product_id desc, 
  products.product_id ASC

Query time 0.00123

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 products range PRIMARY,status PRIMARY 3 30 Using where; Using join buffer (flat, BNL join)
1 SIMPLE shared_descr eq_ref PRIMARY,product_id,company_id PRIMARY 13 toolboxdigitalshop_dev.products.product_id,const,const 1 Using where
1 SIMPLE prc eq_ref PRIMARY PRIMARY 9 toolboxdigitalshop_dev.products.product_id,const 1 Using where; Using index
1 SIMPLE prices ref usergroup,product_id,lower_limit,usergroup_id usergroup 3 toolboxdigitalshop_dev.products.product_id 1 Using where; Using index
1 SIMPLE descr1 eq_ref PRIMARY,product_id PRIMARY 9 toolboxdigitalshop_dev.products.product_id,const 1 Using where
1 SIMPLE products_categories ref PRIMARY,pt pt 3 toolboxdigitalshop_dev.products.product_id 1 Using index
1 SIMPLE cscart_categories eq_ref PRIMARY,c_status,p_category_id PRIMARY 3 toolboxdigitalshop_dev.products_categories.category_id 1 Using where

Result

product_id product company_name product_type parent_product_id
101808 Rougn N Tough (Adam M Remix) Toolbox Digital Shop P 0
101807 Sweat Box (Original Mix) Toolbox Digital Shop P 0
101806 Don't Cross The Line (Paul Glazby Remix) Toolbox Digital Shop P 0
101805 Cookie 10 (Original Mix) Toolbox Digital Shop P 0
101804 Cookie 8 (Original Mix) Toolbox Digital Shop P 0
101803 Vaccum Packed (Justin Bourne & Dynamic Intervention Remix) Toolbox Digital Shop P 0
101802 Typhoid (Original Mix) Toolbox Digital Shop P 0
101801 Begonia (Original Mix) Toolbox Digital Shop P 0
101800 The Hulk (Original Mix) Toolbox Digital Shop P 0
101799 Victory & Defeat (Original Mix) Toolbox Digital Shop P 0
101798 Eternal Hoover (Original Mix) Toolbox Digital Shop P 0
101797 Silky Sounds (Original Mix) Toolbox Digital Shop P 0
101796 Charlie & The Giant Hoover (Original Mix) Toolbox Digital Shop P 0
101795 Beat The Bass (Original Mix) Toolbox Digital Shop P 0
101794 3 Turntables (Paul Glazby Remix) Toolbox Digital Shop P 0
101793 Where's The Hoover? (Original Mix) Toolbox Digital Shop P 0
101792 Stalker (Original Mix) Toolbox Digital Shop P 0
101791 Here We Go (Original Mix) Toolbox Digital Shop P 0
101790 Etherwave (Original Mix) Toolbox Digital Shop P 0
101789 More Drugs (Original Mix) Toolbox Digital Shop P 0
101788 Repent (Paul Glazby Remix) Toolbox Digital Shop P 0
101787 Bamzooki (Original Mix) Toolbox Digital Shop P 0
101786 Pure Energy (Glazby Remix) Toolbox Digital Shop P 0
101785 Ravers Delight (Original Mix) Toolbox Digital Shop P 0
101784 Databass (Original Mix) Toolbox Digital Shop P 0
101783 Frantic Theme (Get A Life) (BK's Classic 3AM At Frantic Mix) Toolbox Digital Shop P 0
101782 What Ya Got Left (Original Mix) Toolbox Digital Shop P 0
101781 Demons (Original Mix) Toolbox Digital Shop P 0
101780 Reflux (Original Mix) Toolbox Digital Shop P 0
101779 Funky Ass Wax (Part 2) Toolbox Digital Shop P 0