Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b03038ccaa4372ba4de99e3b89e51adc5dbe011bfad055e4171ae40d5544b2' 
  AND token = 'XhdWaiYqI9+QX8gdricpeo+QcD+uQIHTezOB3WxQtaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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