Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a9ebc0f13883fa41bc783b0797a0e658ba87cc0355a9dc4f1b755adb845e9677' 
  AND token = 'KnUDtF0+zU4wCHC+AiWgxd3pop7SHWyS3t3CA7WVBE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00762

JSON explain

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