Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b429fd071029b7e837003e3f5bb312ce5cf507ef6c391b93bbc7e35e0c5a41' 
  AND token = 'oP4yXmjTPpN9iL4a8jqjUDwxwzzRMO+4mdffiaIpnvw=' 
  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"
    }
  }
}