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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c231518451eb818bf3bd6f54f572eb36f782c60491bb68980c7e5b9f55668c' 
  AND token = 'nkBYtFVd4ID+mQzkw77s933ejRc1mf1cyDVdR76Zk3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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