Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885cfb853fbe0372e8f803597493364607f652def3a58bfa0994167be28985bf' 
  AND token = 'pE8zUkWdvxGmyz1oAHUOoc8NaF/Y0ktp2kRpDIrXqzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}