SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfae4f1b4940be2bff3209471d63bcd54dc5f2f1007a3dc099394f349df66a2b' 
  AND token = 'zzA98wyJM3JlA/BSITQpWMYaKUZK13IzFshMnAjqDOA=' 
  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"
    }
  }
}