The string you provided appears to be a payload. This specific snippet is designed to test if a web application's database is vulnerable by forcing a deliberate delay in the server's response. Article: Anatomy of a Blind SQL Injection Payload
The segment and(select 1)>0 serves as a simple "Always True" condition. Blind SQL Injection | OWASP Foundation
The payload "Xara Designer Pro Plus 21'and(select 1)>0waitfor/**/delay'0:0:0" can be broken down into three distinct components used by security researchers (and attackers) to probe for database vulnerabilities.
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