SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199a6ab5da973fc56fc89ca0eff297d58790b5b29427c583e06146f07382f042' 
  AND token = 'sOySJUz5ZHvuOz3JA2qQfzyY6B6t6xHR/FIKr/E5OgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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