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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2be910f551c53c788a868fee83676680f899e3ce05449f831affc87b4d46462d' 
  AND token = 'i20sJNpzTLWjbKRbffv+C1kziHgkWE49xvUSL2JmE4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00750

JSON explain

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