Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e731339233a8f05c1a80cc78ee209638523c7a29a74d54f513d196538d20ca8' 
  AND token = 'SJrE1QzvAsQmntYlUyIWahEd6Wumz1kiCu8k5xzctjY=' 
  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"
    }
  }
}