Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a68d20c90b024223dff0e4d537b9f554fc788bc4229c46ddcf408a80bee4f13' 
  AND token = 'MCO5wIb82klNyXvlpAYrvWTglQqz48q9IQ7aWPJ2xqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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