SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '45f0f71e461db349e774a8bd0a1bbb895075e6cfb628e9893fe5349bec46259d' 
  AND token = 'vL3Y3cEAYkJ9dQnS6tXrDfMluPXPBZj+1JxxV+zkMPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00738

JSON explain

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