SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ac21862a7d92d843d32af0b3bd5347cf48291a5ecbc6633d2bed7cef111ecf' 
  AND token = 'hvarCD0IVuELN8GatvCBB9/OpmKj257NKPVAVunbOzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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