SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f45dc2c776de31c94ea83f6daf85cf92617a9919c52ad25d2e1d3f60b8af08f' 
  AND token = 'Lwb3oZhzP0zozYwHDY4DumB3ki9+mWy3Zu4ArxJgass=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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