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 (
        66692, 66693, 66694, 66695, 66696, 66697, 
        66698, 66700, 66701, 66702, 66703, 
        66704, 66705, 66706, 66707, 66708, 
        66709, 66710, 66711, 66712, 66713, 
        66714, 66715, 66716
      )
    ) 
    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 0.00161

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 24 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
66716 ReBorn (Original Mix) Toolbox Digital Shop P 0
66715 Titan (Original Mix) Toolbox Digital Shop P 0
66714 House Work (Original Mix) Toolbox Digital Shop P 0
66713 Alarm (Original Mix) Toolbox Digital Shop P 0
66712 Dark Sky (MOB Remix) Toolbox Digital Shop P 0
66711 Back 2 The Old Skool (Original Mix) Toolbox Digital Shop P 0
66710 Moonlight (Extended Mix) Toolbox Digital Shop P 0
66709 Wildchild (Original Mix) Toolbox Digital Shop P 0
66708 Music Is My Saviour (DJ Edit) Toolbox Digital Shop P 0
66707 Only You (Original Mix) Toolbox Digital Shop P 0
66706 I Dare You (Original Mix) Toolbox Digital Shop P 0
66705 Full Control (Original Mix) Toolbox Digital Shop P 0
66704 Laser Lips (Original Mix) Toolbox Digital Shop P 0
66703 Pump Clubbets (Original Mix) Toolbox Digital Shop P 0
66702 2004 (Hagane Shizuka Remix) Toolbox Digital Shop P 0
66701 Save Me (Obsidian Project Remix) Toolbox Digital Shop P 0
66700 Everybody Rave (Original Mix) Toolbox Digital Shop P 0
66698 Something Real (Original Mix) Toolbox Digital Shop P 0
66697 Bandit (Original Mix) Toolbox Digital Shop P 0
66696 A Feeling (Joe Longbottom & Leigh D Remix) Toolbox Digital Shop P 0
66695 Hard Dance (Original Mix) Toolbox Digital Shop P 0
66694 Back To Life (Groove Complex & Kye Shand Remix) Toolbox Digital Shop P 0
66693 Our Style (Original Mix) Toolbox Digital Shop P 0
66692 Original Gangsta MKE (Original Mix) Toolbox Digital Shop P 0