SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c07d7eb33f59760bcba4195828052441b60ebd970418c576c8a682f57353c75d' 
  AND token = '7ljJ+3yFbGPe1uiIo8+VI5uuvi9hgpum4DaOzrPuz2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00964

JSON explain

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