SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc855b7fe834942bf3ce8addc3841e0b2cbfce92d85647e3251bacf23ef88c3' 
  AND token = 'ZNYmSo/pASBH9UFH+TTl7hG+9C7loxzgBqr3AiwBHCI=' 
  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"
    }
  }
}