Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518527b6d1fbc9d6a34b4e4668b82092d95cea94049def4f3d8830ca3e01a5cc' 
  AND token = 'TZjqEMcLQME2QBw6goB4jGakDaT4BkxtvUaAU3xoONA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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