Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '141ac984def28b4f6378cc1238a97e2a938d74f84ad75644b6bd06da16b55382' 
  AND token = '6c1moDpTpbavTJur12/pTTpQPZjd7ktUf/Hbz8gxK4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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