SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc8aad7f9733f3612f9daacae830bcbf0a6494f5c351406bd25598f6822a411' 
  AND token = 'O1WQtJVHssDCOiU0+cM/vYRp6bZB3soh9S+Vdl07CeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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