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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f06935e3f6d64b64529d1d38dd7f54e664d04ee291ae17f7590faa75fd8d41' 
  AND token = '588MAhjSt30Q2lReK+lJ8X6BSyoWguEYqo+7cD4fr8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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