SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127faf54587c3cff506169bbbc7b325fd804efde7c1a571d268b1b0236e01a77' 
  AND token = 'zlYF4CHwsj4DSTAQfueEPjT+R+dl9asvC/aJ9YIxCBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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