SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3232f64c291e994010c73bb3c30c52268eaf6251345f548e80f978f34104dab9' 
  AND token = 'eQ+Rii1zetDbJvVXwEh8AHUxuFuQYJNWHc+o76QXX/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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