Someone

SELECT * FROM galleries
 JOIN (SELECT r1.random_id
        FROM galleries_holes AS r1
        JOIN (SELECT (RAND() *
                     (SELECT MAX(row_id)
                        FROM galleries_holes)) AS row_id)
              AS r2
LEFT JOIN galleries on (galleries.id=r2.row_id)  # i added
       WHERE r1.row_id >= r2.row_id
AND galleries.id = 74580                         # i added
       ORDER BY r1.row_id ASC
       LIMIT 1) as rows ON (id = random_id);