SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a5f1823d186398354207a859f4cba6a51a67ce4334e1f01da7ad911aa9ec5b' 
  AND token = 'QX5yTsVjYi9ZsnxQCHlD+0zJVSHr+7h2UviwBSsg2nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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