Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284e17aef8a0175ace0aec37503ff9e7e5cc71cffb7f49743eb5ee39f01292f2' 
  AND token = 'kz4sgAwwGcUqFxW6YpHKNhyzuLba0vlHrDoDXUBlhNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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