SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a66a4bbd10f7629a9fe93740cb917fc2fdf1b796aded45c9822990c0ab2453b' 
  AND token = 'pbCA3o4zG3uElf/Ap5K+UG8BxHbtXLpx84ZhEsFjAQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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