SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f566972167f2471592f81fe7764494f76a97ba2c93b5aec221b74f658de76c38' 
  AND token = 'cC5UGi6dJOIhUb6YU/iKzgbfEFNWQ4FsPLcLmgH8LvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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