SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    12694, 12695, 12696, 12697, 12698, 12699, 
    12581, 10459, 10460, 10461, 10462, 
    10463, 10464, 10465, 12584, 12583, 
    12582, 10466, 10467, 10468
  )

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (12694,12695,12696,12697,12698,12699,12581,10459,10460,10461,10462,10463,10464,10465,12584,12583,12582,10466,10467,10468)"
    }
  }
}