SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62a3c8bf33b6285159fd001109cb3f793af78c24426f2e1c4c7e97882094d95' 
  AND token = 'pxPkHqopT5J7meMY+4VDs3kpXUjOJvurZHFNbDcQ+yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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