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 (
        65897, 65898, 65899, 65900, 65901, 65902, 
        65903, 65904, 65905, 65906, 65907, 
        65908, 65909, 65910, 65911, 65912, 
        65913, 65914, 65915, 65916, 65917, 
        65918, 65919, 65920, 65921, 65922, 
        65923, 65924, 65925, 65926
      )
    ) 
    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 0.00179

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
65926 Love Comes Down (Original Mix) Toolbox Digital Shop P 0
65925 Hold Me Tight (Original Mix) Toolbox Digital Shop P 0
65924 Out Of The Blues (Original Mix) Toolbox Digital Shop P 0
65923 Wastin' Time (Original Mix) Toolbox Digital Shop P 0
65922 Lovin' Like (Original Mix) Toolbox Digital Shop P 0
65921 Thunderstruck (Original Mix) Toolbox Digital Shop P 0
65920 Mind Twister (Original Mix) Toolbox Digital Shop P 0
65919 Feel Donna's Love (Original Mix) Toolbox Digital Shop P 0
65918 Bad Habits (Original Mix) Toolbox Digital Shop P 0
65917 Round & Round (Original Mix) Toolbox Digital Shop P 0
65916 Such A Good Feeling (The Freak Brothers Remix) Toolbox Digital Shop P 0
65915 Feel The Same (Original Mix) Toolbox Digital Shop P 0
65914 Emotion (Technikal's Tidy Two Remix) Toolbox Digital Shop P 0
65913 Let The Music Play (Original Mix) Toolbox Digital Shop P 0
65912 Strings For Yasmin (Original Mix) Toolbox Digital Shop P 0
65911 Waiting For (Original Mix) Toolbox Digital Shop P 0
65910 Deep Down (Original Mix) Toolbox Digital Shop P 0
65909 Stop The Tunage (Original Mix) Toolbox Digital Shop P 0
65908 Two Of A Kind (Original Mix) Toolbox Digital Shop P 0
65907 A Little More (Original Mix) Toolbox Digital Shop P 0
65906 Essential Tremor (Original Mix) Toolbox Digital Shop P 0
65905 Buddy Love (Original Mix) Toolbox Digital Shop P 0
65904 High Five (Original Mix) Toolbox Digital Shop P 0
65903 Enigmatic Emotions (Original Mix) Toolbox Digital Shop P 0
65902 Surreal (Original Mix) Toolbox Digital Shop P 0
65901 The Ultimate (Original Mix) Toolbox Digital Shop P 0
65900 The Night (Original Mix) Toolbox Digital Shop P 0
65899 Mistakes (Ilogik Remix) Toolbox Digital Shop P 0
65898 When I'm Gone (Original Mix) Toolbox Digital Shop P 0
65897 U Got 2 Know (Original Mix) Toolbox Digital Shop P 0