SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0923590cbc85839c4444abe8f671f1d4fa2d7fe6fa49ea6ee9db9bc8e7632d11' 
  AND token = 'GhEVRuNDDuoJt/UMYl7sYHuX1rr7QqWoVMWHSnULwQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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