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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8ebf0cc55ce4a9fab92711ede5f68178fad6a2a80eacdca922692b6bea326952' 
  AND token = 'eO0f/LNh8pj6mpqSIB+y4l3QeP7AApwD5rhDi0+P7B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00758

JSON explain

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