SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    61075, 61083, 61071, 61694, 61081, 61697, 
    61558, 61684, 65455
  )

Query time 0.00089

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": 9,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (61075,61083,61071,61694,61081,61697,61558,61684,65455)"
    }
  }
}

Result