Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b7ce5fde89e863534cd202f96a254599ddb6be1513f693514e0eec68968b41' 
  AND token = 'XSgJFEcxvnAN8mXiXO3F/xIM38muBj4JxY+SN4suVso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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