SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3828ab59a068fe0585c24ba89fe97bf9cb6f2f22325b6773377dd207194d98e1' 
  AND token = 'CaAKg32mvhCk8dxkcJ230iXXGgvZYwTmYnWOKDvHdS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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