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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1f9b290cd7f8c7ba2afda6f7b8fdaa880df8532e9cce7f754ad3cbc2629204eb' 
  AND token = 'vyeMsP5LqX1QlXruTpfW1FHLtgWApTQkFsLJ4B6sKvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00883

JSON explain

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