Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860358326bcfdea26a3b89083ecad0496dfc80416386b8230d735f56432f42b7' 
  AND token = 'iSIbXJFJgEZoiY9ClzD3bNsmSSOTqhbluJKMDg65A8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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