SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb744e708a2096b398c2a8b023b97af484529f9fe032e73b33b8b1e3a0df5fd' 
  AND token = '0MvgrKChlYEIXNeVgGw8v8Go9/hq0Vrzx/bOze5GEJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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