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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'dfe5cea95eda8683df85ea2b5de4fdcefbac04760ba09fa1db9707f6e32d2d23' 
  AND token = 'Oe6h5V8ceaU49y3flzF74lPGYBdqOEajc5FNPRAhciU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00902

JSON explain

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