SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902fa81049d5492c5dd77d0deb010ae625f7a34cd52c9859a6f7c7ef0585fc23' 
  AND token = 'I87Gf2X34sTR/lZpXZB57ibGdhA1wqzo6/VJoSy9zvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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