SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bf509c88afe82cd5dceb75b2a919e727d4c9f5dddff28d850db72266f1d03e' 
  AND token = 'bGjqvsP2LoWap+/HVO+ZIDGB/G9Bp8AugyQjpRcHq+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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