Write SQL query to solve given problem: What are the width and height of the bounding box of the object with "keyboard" as their object class and (5, 647) as their coordinate?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.W, T1.H FROM IMG_OBJ AS T1 INNER JOIN OBJ_CLASSES AS T2 ON T1.OBJ_CLASS_ID = T2.OBJ_CLASS_ID WHERE T2.OBJ_CLASS = 'keyboard' AND T1.X = 5 AND T1.Y = 647