SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8074def1635b14a14e43f467de3a793c8c890dfeb596170f5a74ffdd5d8dbec5' 
  AND token = 'Oqvyt3Z2GsZNlzmNz8V9kwUgq9gj8fIqZTdqZLpJBtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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