SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810c64d2971908d272435a1a2fbfaa08cd4b23284e9804f5bc0f018b650aa98f' 
  AND token = 'xsBfAzPUggx+PwNvWOVwkSlLLRG+/l0je3pvTMu3nzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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