I need it slow and deep

SELECT * FROM gallery2 WHERE topic_id="1438412" UNION SELECT * FROM gallery2 WHERE topic_id="1601266" UNION SELECT * FROM gallery2 WHERE topic_id="1520772" UNION SELECT * FROM gallery2 WHERE topic_id="497828" UNION SELECT * FROM gallery2 WHERE topic_id="353050" UNION SELECT * FROM gallery2 WHERE topic_id="845277" UNION SELECT * FROM gallery2 WHERE topic_id="980219" UNION SELECT * FROM gallery2 WHERE topic_id="136841" UNION SELECT * FROM gallery2 WHERE topic_id="1591946" UNION SELECT * FROM gallery2 WHERE topic_id="129378" UNION SELECT * FROM gallery2 WHERE topic_id="189136" UNION SELECT * FROM gallery2 WHERE topic_id="329048" UNION SELECT * FROM gallery2 WHERE topic_id="995310" UNION SELECT * FROM gallery2 WHERE topic_id="422254" UNION SELECT * FROM gallery2 WHERE topic_id="1361262" UNION SELECT * FROM gallery2 WHERE topic_id="132720"