Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a263947eab90cee1a5fcf080ad915daef40d0109d31b02fcb008122b24f9dde4' 
  AND token = 'MYxG+Y6oz0iOs7QvhwIWfsFKk1jqlwKvPaVta2mLVDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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