SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    23333, 23357, 20260, 20261, 20262, 20263, 
    20264, 20242, 20244, 20245, 20246, 
    20247, 20248, 20249, 20312, 20243, 
    20250, 21493, 20311, 22231, 20907, 
    20349, 21566, 21531
  )

Query time 0.00092

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": 24,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (23333,23357,20260,20261,20262,20263,20264,20242,20244,20245,20246,20247,20248,20249,20312,20243,20250,21493,20311,22231,20907,20349,21566,21531)"
        }
      }
    ]
  }
}