SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9de122d6d5627f2749e4b1c93e3e85c2b60f19f78e865969c1e5b73cd10af448' 
  AND token = 'R+5E87mfNTbzOBqNHhvLDHasH1jUHimVcn+OtgaXVaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01479

JSON explain

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