SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda732e958cdf1ed1219ccf678820cf9142d6e409468c8f07d6048a9b5cb5aaa' 
  AND token = 'KhAorYzwHCYfIS+pb7tjn+mhGQIe1uP1jR8Ra+XmQZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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