Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0284c64804ab71c468368f283bff843db9f4ad380f30b270c95397ee57585d90' 
  AND token = '2lPyevLkGYPKl3ojKgbg2ku0HeCLkGJ36RJUg7dIOzw=' 
  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"
    }
  }
}