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 (
        42246, 42247, 42248, 42249, 42250, 42251, 
        42252, 42253, 42254, 42255, 42256, 
        42257, 42258, 42259, 42260, 42261, 
        42262, 42263, 42264, 42265, 42266, 
        42267, 42268, 42269, 42270
      )
    ) 
    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 0.00252

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 25 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
42270 Hoover You (Nikkdbubble Remix) Toolbox Digital Shop P 0
42269 Straightjacket (Original Mix) Toolbox Digital Shop P 0
42268 Fat Henry (Original Mix) Toolbox Digital Shop P 0
42267 Psycopath (Original Mix) Toolbox Digital Shop P 0
42266 Rock This! (Blended By Sam Crow) Toolbox Digital Shop P 0
42265 No Time For Jesus (Original Mix) Toolbox Digital Shop P 0
42264 Rumours (Original Mix) Toolbox Digital Shop P 0
42263 The Chamber (Original Mix) Toolbox Digital Shop P 0
42262 (Tell Me) Toyboy (Venkman Remix) Toolbox Digital Shop P 0
42261 You Are In The Move! (Original Mix) Toolbox Digital Shop P 0
42260 Psycotic Bass (Original Mix) Toolbox Digital Shop P 0
42259 Never Back Down (Original Mix) Toolbox Digital Shop P 0
42258 Start Again (Original Mix) Toolbox Digital Shop P 0
42257 Scar (Original Mix) Toolbox Digital Shop P 0
42256 Public Hanging (Terminated) (Original Mix) Toolbox Digital Shop P 0
42255 Tuff Puff (Original Mix) Toolbox Digital Shop P 0
42254 F*ck The Tax Man (Original Mix) Toolbox Digital Shop P 0
42253 Gangster (Original Mix) Toolbox Digital Shop P 0
42252 Groove Pool (Original Mix) Toolbox Digital Shop P 0
42251 Circle 1 (Original Mix) Toolbox Digital Shop P 0
42250 Polka (Basic Pulse Remix) Toolbox Digital Shop P 0
42249 Whirlwind (Original Mix) Toolbox Digital Shop P 0
42248 Rip N Snort (Original Mix) Toolbox Digital Shop P 0
42247 Up To No Good (Original Mix) Toolbox Digital Shop P 0
42246 Code Red (Original Mix) Toolbox Digital Shop P 0