SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    40824, 5554, 5779, 23406, 49306, 3774, 
    2113, 27360, 2926, 2471, 5551, 3168, 
    3663, 2294, 5553, 41170, 1429, 5834, 
    36746, 3170, 4072, 47902, 27362, 21065, 
    6560, 36399, 2085, 2087, 6561, 4894, 
    49265, 3470
  )

Query time 0.00305

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 32,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (40824,5554,5779,23406,49306,3774,2113,27360,2926,2471,5551,3168,3663,2294,5553,41170,1429,5834,36746,3170,4072,47902,27362,21065,6560,36399,2085,2087,6561,4894,49265,3470)"
        }
      }
    ]
  }
}