SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b10911b7d69786c36ab10eb0cfef4edd72d444c85fbe92d2ca65b8c7604b39' 
  AND token = 'eb+pjD8vwEpLadMZZgbnqzLTOY7/Xd5RmT5dR0umBKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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