SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed8981641928c457d3c75b3b125aa068042994e2495c32c22f301d1ce97106c' 
  AND token = 'ZY1psQCtxXiwlWHkYxBUlC9vbV6ugbHW+DWwpRVGeMs=' 
  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"
    }
  }
}