SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bac860a7718650168c2f28884779729ecd5f873d92f3ae08eeb2d2e51b76fa2' 
  AND token = 'nsGezh5BbAq/v4nm5MZNNU/LxqLIBF6jgXL7OLZ9oLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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