SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca7c422584c7c490527dd76e23b9e0beccfa2b71943de64e4c118d0303e22fb' 
  AND token = 'kqz1tHRBAGapQJthgDbDCdZiJwlTfeKJV5XhV3EOx/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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