SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fd05347d20019fa63585e883958626a55ec840252b6f014ea3ae7f2bd07dbb' 
  AND token = 'f7CK81gIFbvwonhNVPz99jFMCC/BRcuXqMJLZKxg7/c=' 
  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"
    }
  }
}