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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9f17f350d2f47197c671f98f9565a73f66d5bdd29f1ca458b3803b7f7943f990' 
  AND token = 'JRId+GdlQdTMvqLHzloub3W+JQ9PKox7l+1wT58CZMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00903

JSON explain

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