Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c6b4c960e13bbde68bd1268ed6b1cd6336ec374287b337eabce4f61c8d025e03' 
  AND token = 'h3M8cOSRlsCD/zQ7GspZyPJKix2qQqMR81thk/fLBoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}