SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482da0d967dd81b66e5ec598deb1bfc3b95739824778a236dcf3d48fbba978cf' 
  AND token = 'hiKPG6OVyAYjeW9wcnqHBpZgMEuBCl9Feir6KYJWNH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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