SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7a2d70c960c3c1a96ef81d9e95b83f676637a289384ad63e1db504e99997ba' 
  AND token = 'HXGoLf32CBJT40H2JauSYOVfFZrY2tprZ4DCKGuKAvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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