SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32097dc4a2b3616b08629c87e55915086056bbffdff5ea427d5d0e0f67a9417c' 
  AND token = '1BJM062CZ+Pxq0j0KteRPgPaHt+Q/kpvdseVECs4TBw=' 
  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"
    }
  }
}