Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2747575f011cad8cb097aacb3bb6f3079d0292636c0b7a449ce3c169bae252' 
  AND token = 'xnrN5iRwb9sYDYnv/ZwNfjIq3ecy3H/cnw9kC8Eq3mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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