SELECT 
  tmall_products.* 
FROM 
  tmall_products 
WHERE 
  tmall_products.product_id IN (
    145, 117, 113, 157, 68, 29, 6, 8, 14, 9, 
    10, 19, 21, 50, 51, 49, 48, 54
  )

Query time 0.00983

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.03187741,
    "nested_loop": [
      {
        "table": {
          "table_name": "tmall_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 18,
          "cost": 0.03187741,
          "filtered": 100,
          "index_condition": "tmall_products.product_id in (145,117,113,157,68,29,6,8,14,9,10,19,21,50,51,49,48,54)"
        }
      }
    ]
  }
}