SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eef267628f7a845d3571e8d8ba670aad76af12d23a36432d8d3691c9c854469' 
  AND token = 'VPLBeavEv/caRpAwuKuACJKrKjEWUx4yZvHpZs8sD1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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