SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    1097, 1268, 1284, 1296, 1326, 1338, 1345, 
    1366, 1379, 1381, 1402, 1405
  )

Query time 0.00128

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": 12,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (1097,1268,1284,1296,1326,1338,1345,1366,1379,1381,1402,1405)"
    }
  }
}