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 (
    67257, 67256, 66534, 67158, 67208, 67196, 
    67195, 66979, 66878, 66812, 66787, 
    66527, 65967, 66881, 67016, 67014, 
    66981, 66980, 66784, 66622, 66621, 
    66393, 61786, 66986, 66985, 66978, 
    66846, 66843, 66842, 66783, 66780, 
    66286, 66283, 66214, 66779, 65966, 
    66533, 66729, 66594, 66287
  ) 
GROUP BY 
  cscart_products_categories.product_id