Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed040472d52cc58a9c7fb1611c01c0f59d13dd65d349072562979d5a56af9d5' 
  AND token = 'REvXrT0WFCXHPuzjD1344FnbsC0NFqpIXGxv8pkR1lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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