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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '41cb1fe06dc228f1d92aa0a8fa526dcda7cd56ee2edfb0980f922c0f7e715c51' 
  AND token = 'FbqKctJCfQw3ivBeCBUeQeXhXXEbj/h4iPPzNox4PvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00787

JSON explain

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