Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041a98f16fce21b576260bcda4a35ad98f74d30296954c6fd569f7de92636f3b' 
  AND token = 'rBJG/FJCcb9DILBZ1SMCEfwGQtuC8sniFZ+keG15lMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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