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 (
        104603, 104604, 104605, 104606, 104607, 
        104608, 104609, 104610, 104611, 104612, 
        104613, 104614, 104615, 104616, 104617, 
        104618, 104619, 104620, 104621, 104622, 
        104623, 104624, 104625, 104626, 104627, 
        104628, 104629, 104630, 104631, 104632
      )
    ) 
    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 0.00150

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
104632 Traumatic (Random But Raw Remix) Toolbox Digital Shop P 0
104631 Hostile (Scallywags Remix) Toolbox Digital Shop P 0
104630 Comatosed (Original Mix) Toolbox Digital Shop P 0
104629 Kick It (Wayne German Remix) Toolbox Digital Shop P 0
104628 Hotter Than The Sun (Original Mix) Toolbox Digital Shop P 0
104627 Terminator (Original Mix) Toolbox Digital Shop P 0
104626 Jackanackanory (Original Mix) Toolbox Digital Shop P 0
104625 Back To Earth (Original Mix) Toolbox Digital Shop P 0
104624 Mugged Off (Original Mix) Toolbox Digital Shop P 0
104623 Vicious (Original Mix) Toolbox Digital Shop P 0
104622 You Won't Last (Original Mix) Toolbox Digital Shop P 0
104621 Flow (Adam M Remix) Toolbox Digital Shop P 0
104620 Make You Wanna Move (Original Mix) Toolbox Digital Shop P 0
104619 The Rhythum (Original Mix) Toolbox Digital Shop P 0
104618 Go On Gurl (Original Mix) Toolbox Digital Shop P 0
104617 Feel Right (Original Mix) Toolbox Digital Shop P 0
104616 Find Me (Original Mix) Toolbox Digital Shop P 0
104615 I Wanna Love (Original Mix) Toolbox Digital Shop P 0
104614 Recommunicate (Original Mix) Toolbox Digital Shop P 0
104613 My Kind Of Company (Paul King Remix) Toolbox Digital Shop P 0
104612 Are You Scared (Original Mix) Toolbox Digital Shop P 0
104611 Watch Out (Original Mix) Toolbox Digital Shop P 0
104610 Git Up (Paul King Remix) Toolbox Digital Shop P 0
104609 Flemish Weaver (Original Mix) Toolbox Digital Shop P 0
104608 Illuminatae (Original Mix) Toolbox Digital Shop P 0
104607 Drama Liama (Original Mix) Toolbox Digital Shop P 0
104606 Forward (Original Mix) Toolbox Digital Shop P 0
104605 Cock-A-Hoop (Original Mix) Toolbox Digital Shop P 0
104604 Do The Do (Original Mix) Toolbox Digital Shop P 0
104603 Surf & Turf (Original Mix) Toolbox Digital Shop P 0