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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9466b1e7758ad303a9c2793bee20182e7b35302812c8cc5b67eba51eeafbc441' 
  AND token = '0L8MrOYcPVSIaX5Ga3LQuVIXHBzGhw96fm1ARpO9QNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00926

JSON explain

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