SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    61446, 62843, 63852, 62839, 62841, 63853, 
    63854, 62840, 61448, 62845, 62847, 
    64947, 64849, 64850
  )

Query time 0.00084

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": 14,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (61446,62843,63852,62839,62841,63853,63854,62840,61448,62845,62847,64947,64849,64850)"
    }
  }
}

Result