SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c090c1c23f268449fb1af59a42809dba59b98df73e9b5c77e9fa7f960111c1d' 
  AND token = 'A+ZdHUFwY/+qHqIgJYuuaMXPF7wtp/wu5R7Fio6ZJvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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