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 = 4 
WHERE 
  cscart_products_categories.product_id IN (
    68280, 68279, 68278, 68277, 68276, 68275, 
    68274, 68575, 68204, 68406, 68375, 
    78288, 78287, 78286, 78285, 78284, 
    78283, 78282, 78281, 78280, 78279, 
    78278, 78277, 78276, 78275, 78274, 
    78273, 78272, 78271, 78270, 78269, 
    78268, 78267, 78266, 78265, 78264, 
    78263, 78262, 68395, 68189
  ) 
GROUP BY 
  cscart_products_categories.product_id