SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a6409798e50528a80c301494fd0b601d3d111650bb8c3cd3368109b496fba7' 
  AND token = 'V4najyG4yPuZjHFmHoqq/OHDMfSuD8DUEs+oNt/YSF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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