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 (
    70121, 70812, 70727, 70339, 70697, 70696, 
    70695, 70694, 70640, 70600, 70584, 
    70539, 70432, 70357, 70587, 70586, 
    70583, 70579, 70537, 70493, 70120, 
    69978, 69977, 70358, 70462, 70459, 
    70458, 70433, 69982, 70435, 70434, 
    70362, 70015, 70014, 70235, 70234, 
    70161, 70119, 69980, 69745
  ) 
GROUP BY 
  cscart_products_categories.product_id