SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222fdecff8a661653bcece195ec489a95089dd1e31220d577dd35796f9535e5c' 
  AND token = 'rhzq1k0VB+CU2wYEK+5MDX0PVAaYvq77/ZuuAtKb1Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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