SELECT 
  * 
FROM 
  cscart_mb_salvage_cases 
WHERE 
  auction_product_id IN (
    20733, 20734, 20735, 20736, 20737, 20738, 
    20739, 20740, 20741, 20742, 20743, 
    20744, 20745, 20746, 20747, 20748
  ) 
  OR sale_product_id IN (
    20733, 20734, 20735, 20736, 20737, 20738, 
    20739, 20740, 20741, 20742, 20743, 
    20744, 20745, 20746, 20747, 20748
  ) 
ORDER BY 
  updated_at DESC, 
  case_id DESC

Query time 0.00030

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": 56,
          "filtered": 100,
          "attached_condition": "cscart_mb_salvage_cases.auction_product_id in (20733,20734,20735,20736,20737,20738,20739,20740,20741,20742,20743,20744,20745,20746,20747,20748) or cscart_mb_salvage_cases.sale_product_id in (20733,20734,20735,20736,20737,20738,20739,20740,20741,20742,20743,20744,20745,20746,20747,20748)"
        }
      }
    }
  }
}