SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91002aec4a1aba3277c89fdd534bb0de16f80f7b80070c2b8efe585d66b02686' 
  AND token = 'W+Bq+P2btzhzJoLMqlBaLdooH4pB24HUwD30AnVYvnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables