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 cscart_categories.category_id IN (6, 35, 80) 
  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 (
    products.available_worldwide = 'Y' 
    OR prc.country_code IS NULL
  ) 
  AND !(
    products.out_of_stock_actions = 'B' && products.avail_since > 1747386623
  ) 
  AND products.parent_product_id = 0 
GROUP BY 
  products.product_id 
ORDER BY 
  products.timestamp desc, 
  products.product_id desc, 
  products.product_id ASC 
LIMIT 
  5040, 40

Query time 0.10743

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 cscart_categories range PRIMARY,c_status,p_category_id PRIMARY 3 3 Using where; Using join buffer (flat, BNL join)
1 SIMPLE products_categories ref PRIMARY,pt PRIMARY 3 toolboxdigitalshop_dev.cscart_categories.category_id 908 Using index
1 SIMPLE products eq_ref PRIMARY,status,idx_parent_product_id PRIMARY 3 toolboxdigitalshop_dev.products_categories.product_id 1 Using where
1 SIMPLE shared_descr eq_ref PRIMARY,product_id,company_id PRIMARY 13 toolboxdigitalshop_dev.products_categories.product_id,const,const 1 Using where
1 SIMPLE prc eq_ref PRIMARY PRIMARY 9 toolboxdigitalshop_dev.products_categories.product_id,const 1 Using where; Using index
1 SIMPLE descr1 eq_ref PRIMARY,product_id PRIMARY 9 toolboxdigitalshop_dev.products_categories.product_id,const 1 Using where
1 SIMPLE prices ref usergroup,product_id,lower_limit,usergroup_id usergroup 3 toolboxdigitalshop_dev.products_categories.product_id 1 Using where; Using index

Result

product_id product company_name product_type parent_product_id
73780 808 Toolbox Digital Shop P 0
73779 Believe Toolbox Digital Shop P 0
73756 Lightning Strikes (Original Mix) Toolbox Digital Shop P 0
73689 Logic Answer (Original Mix) Toolbox Digital Shop P 0
73597 Arms In The Air Toolbox Digital Shop P 0
73339 Bibbidi-Bobbidi-Boo Toolbox Digital Shop P 0
73242 Can You Feel? - Original Mix Toolbox Digital Shop P 0
73628 Unidentified (Original Mix) Toolbox Digital Shop P 0
73776 Keep On Toolbox Digital Shop P 0
73775 C4 To The Floor Toolbox Digital Shop P 0
73774 Invasion Toolbox Digital Shop P 0
73773 Razors Edge (The Sticky Bandits Remix) Toolbox Digital Shop P 0
73772 Hoovers Of Hell Toolbox Digital Shop P 0
73771 We Have A Problem Toolbox Digital Shop P 0
73770 I See Power Toolbox Digital Shop P 0
73769 Limitless Toolbox Digital Shop P 0
73768 Oblivion (Jeff Payne Remix) Toolbox Digital Shop P 0
73767 Devastating Rhythm Toolbox Digital Shop P 0
73766 Black Hole Toolbox Digital Shop P 0
73765 Tortured (High Dosage Remix) Toolbox Digital Shop P 0
73764 Fashionably Late Toolbox Digital Shop P 0
73763 Exonerate Toolbox Digital Shop P 0
73762 Get To The Hoover Toolbox Digital Shop P 0
73761 Hostile (Scallywags Remix) Toolbox Digital Shop P 0
73760 Tough Guy Toolbox Digital Shop P 0
73759 Birthright Toolbox Digital Shop P 0
73288 Disco Tap (Original Mix) Toolbox Digital Shop P 0
73311 How Does It Feel? (Original Mix) Toolbox Digital Shop P 0
73283 Back Again (Original Mix) Toolbox Digital Shop P 0
73282 Let The Rhythm (Original Mix) Toolbox Digital Shop P 0
73281 Sexy Batman (Original Mix) Toolbox Digital Shop P 0
73280 Sexy Batman (Radio Edit) Toolbox Digital Shop P 0
73279 Let The Rhythm (Radio Edit) Toolbox Digital Shop P 0
73278 Back Again (Radio Edit) Toolbox Digital Shop P 0
73624 Skittles (Dramatik Remix) Toolbox Digital Shop P 0
73596 Puma (Andy Farley Remix) Toolbox Digital Shop P 0
73595 High Off The Tempo Toolbox Digital Shop P 0
73338 Love Toolbox Digital Shop P 0
73216 Cheeky Tracks Hard 2019 Toolbox Digital Shop P 0
73215 Mercury's Meat (Original Mix) Toolbox Digital Shop P 0