SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3e8218b9cd1fc3c5fb8cf6eaa4c5043f96e5d56794cbc4e24de4f49fc21b6d' 
  AND token = 'qjyBYma/qwwp/jjnCKpz0muvGa6UIRAq7G+RE6TiwMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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