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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1a283746f4a3b7af538457d6459d4812f9c7536d9fa2c39f6f469a8d50e7dff0' 
  AND token = 'zKxs9CJKQ/0he0+51TSdiQACS3eNRdxgQHHnbpZeYiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00806

JSON explain

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