SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e783bbd57792b93bc88527953b4636a927cb5f0cfc79350441a823ddc41ab3d1' 
  AND token = 'Xkfu/t3JCW+YnRZ4KPmbZuX1oV04KvzRMsxJURgdgnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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