SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    1126, 1131, 1381, 1403, 1409, 1089, 1411, 
    1415, 1420, 1425, 1427, 1428
  )

Query time 0.00129

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 (1126,1131,1381,1403,1409,1089,1411,1415,1420,1425,1427,1428)"
    }
  }
}