SELECT 
  * 
FROM 
  cscart_mb_salvage_cases 
WHERE 
  auction_product_id IN (
    21343, 21344, 21345, 21346, 21347, 21348, 
    21349, 21350, 21351, 21352, 21353, 
    21354, 21355, 21356, 21357, 21358
  ) 
  OR sale_product_id IN (
    21343, 21344, 21345, 21346, 21347, 21348, 
    21349, 21350, 21351, 21352, 21353, 
    21354, 21355, 21356, 21357, 21358
  ) 
ORDER BY 
  updated_at DESC, 
  case_id DESC

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_mb_salvage_cases.updated_at desc, cscart_mb_salvage_cases.case_id desc",
        "table": {
          "table_name": "cscart_mb_salvage_cases",
          "access_type": "ALL",
          "rows": 58,
          "filtered": 100,
          "attached_condition": "cscart_mb_salvage_cases.auction_product_id in (21343,21344,21345,21346,21347,21348,21349,21350,21351,21352,21353,21354,21355,21356,21357,21358) or cscart_mb_salvage_cases.sale_product_id in (21343,21344,21345,21346,21347,21348,21349,21350,21351,21352,21353,21354,21355,21356,21357,21358)"
        }
      }
    }
  }
}