Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf6ebfb90135b89115df7c205bf8de27f8dd0af71422e650d81ff9475036f52' 
  AND token = 'DT4PTIMwb3QZScR7EbiPa0O0ryTONrszsq/L04K4UHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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