SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799a5e13544dc2831175bb265134af845d7087b25e3133b0f777b8bf978e991b' 
  AND token = 'IXGrmWmgZ8zAJ8KM9SPKNBL0ZuN9qAIF1J1jIfgnVdw=' 
  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"
    }
  }
}