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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd69809eb4976b18120ebf56ec5392df1d53419247940bc0cfb9f227d9296a4' 
  AND token = 't5WQYWbP0wJ444xpc+7v1H+SvOF78GpzVakfxF7Mo4o=' 
  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"
    }
  }
}