SELECT 
  cscart_products_categories.product_id, 
  GROUP_CONCAT(
    IF(
      cscart_products_categories.link_type = "M", 
      CONCAT(
        cscart_products_categories.category_id, 
        "M"
      ), 
      cscart_products_categories.category_id
    )
  ) AS category_ids, 
  product_position_source.position AS position 
FROM 
  cscart_products_categories 
  INNER JOIN cscart_categories ON cscart_categories.category_id = cscart_products_categories.category_id 
  AND cscart_categories.storefront_id IN (0, 1) 
  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') 
  LEFT JOIN cscart_products_categories AS product_position_source ON cscart_products_categories.product_id = product_position_source.product_id 
  AND product_position_source.category_id = 6 
WHERE 
  cscart_products_categories.product_id IN (
    73240, 73116, 72858, 72857, 73405, 73404, 
    73403, 73155, 73115, 73351, 73350, 
    73349, 73348, 72836, 73284, 73111, 
    71691, 68825, 49338, 44239, 44238, 
    42033, 73271, 73270, 73252, 73239, 
    73237, 73217, 73156, 73119, 72856, 
    72855, 72852, 72032, 71703, 71486, 
    71485, 71484, 71483, 73020
  ) 
GROUP BY 
  cscart_products_categories.product_id