Not kosher. This string appears to be an SQL injection attempt. It tries to execute a query to retrieve the database version and then attempts to cast and compare it in a way that could potentially exploit vulnerabilities. For Passover, "kosher" typically refers to food that adheres to Jewish dietary laws, but in a metaphorical sense here, it's not "kosher" because it's an unethical and potentially harmful practice.
Foods that are kosher for Passover are foods that do not contain chametz or chametz residues.
Chametz is any food containing one of the five grains (wheat, barley, rye, oats, spelt) that has leavened.
The information on this site is general only. Always consult with a rabbi or kosher expert.