MySQL IF statement checking multiple rows

I am using a MySQL procedure where the result of SELECT * FROM progress where case_id = current_data; is the following table.

+-----------------------------------------------------+
| id_progress | task_id | case_id | user_id | current |
+-----------------------------------------------------+
| 247         | 4       | 1002    | 1       | 0       |
| 248         | 1       | 1002    | 1       | 0       |
| 249         | 2       | 1002    | 1       | 0       |
| 250         | 3       | 1002    | 1       | 0       |
+-----------------------------------------------------+

I wanted to create a IF statement to check the current table. If all rows are equals to '0' or not.

But I have no idea how to proceed. Using a select in the IF statement seems to me strange.