SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ebdba44f60a2789be4521f68795ff71e21386831641b520735bba441568f922b' 
  AND token = 'njA5gn7YRT/s+aeqzN7W1A4KDPB+IaJDu3OQkjEDjcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00886

JSON explain

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