SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00313954fe1029ddd3bc8b78dcc6938a79cdd59865125c47cb9cf99d7fcc6efd' 
  AND token = '7VYby0GIiQLgQJwtkQJlnY7PBf1pEK+zajC/J/zt9TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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