SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    4708, 3171, 3773, 3776, 142, 5778, 3771, 
    4710, 2899, 6608, 37305, 6602, 3882, 
    3666, 2566, 5408, 38146, 16612, 313, 
    2321, 5198, 4702, 45505, 1438, 3788, 
    1754, 38145, 38137, 31652, 3787, 1666, 
    38139
  )

Query time 0.00704

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 (4708,3171,3773,3776,142,5778,3771,4710,2899,6608,37305,6602,3882,3666,2566,5408,38146,16612,313,2321,5198,4702,45505,1438,3788,1754,38145,38137,31652,3787,1666,38139)"
        }
      }
    ]
  }
}