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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e321228403f025166033015e049f70d6b842f62aeb345106fc29e513b16e9f64' 
  AND token = 'XIPOoHnIBYryLONiQyroLM80sl4wXGdkc8Ha8yYjFeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00764

JSON explain

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